Neuroscience 2005 Abstract
| Presentation Number: | 975.16 |
|---|---|
| Abstract Title: | Sparse sampling in auditory fmri experiments: a necessity or a waste of time? A combined functional MRI and EEG study. |
| Authors: |
Zanto, T. P.*1
; Marshall, M. L.1
; Fuchs, A.1
; Large, E. W.1
1Center for Complex Systems and Brain Sciences, Florida Atlantic Univ., Boca Raton, FL |
| Primary Theme and Topics |
Sensory and Motor Systems - Auditory -- Auditory cortex: Perception, cognition, and action |
| Session: |
975. Auditory Cortex: Perception, Cognition, and Action Poster |
| Presentation Time: | Wednesday, November 16, 2005 4:00 PM-5:00 PM |
| Location: | Washington Convention Center - Hall A-C, Board # Y9 |
| Keywords: | NOISE, COREGISTER, CONTINUOUS SAMPLING, ELECTROENCEPHALOGRAPHY |
High spatial and temporal resolution is critical to most research utilizing brain imaging techniques. Electroencephalography (EEG) offers high temporal resolution, but poor spatial information whereas functional magnetic resonance imaging (fMRI) yields little temporal information, but has a high spatial and true 3d-volume resolution. Therefore, many researchers utilize both techniques (sometimes even simultaneously) when conducting brain imaging experiments. The fact that fMRI scanners produce a loud pulsing noise during data acquisition is an obvious problem in studies that involve auditory stimuli. This sound cannot be completely shielded from the subjects and necessarily leads to different brain activation as compared to a silent environment hence contaminating the fMRI signal. The problem has been worked around by the development of the sparse sampling technique in which single volumes are acquired with long pauses between them before and after stimulus presentation. This technique is thought to minimize the interaction between the fMRI noise and the stimulus. However, several caveats of using sparse sampling exist, such as an increased scan time and a possible loss of statistical power. Surprisingly, there has been no research conducted on a side-by-side comparison of both continuous and sparse sampling techniques in relation to known auditory evoked responses as recorded in EEG or MEG. Here we first record fMRI during an experiment where subjects listen to auditory stimuli in both a continuous and sparse design. In a second session, we record EEG from the same subjects with the same stimuli that were used in the fMRI session. However, in the second session, the stimuli are presented in both a silent environment as well as overlaid with pre-recorded scanner sound. Comparing the brain responses in the silent and noisy environment together with the fMRI data allows us to study the degree of contamination that originates from the unavoidable scanner noise.
Supported by NSF grant BCS-0094229
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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